.chatter_sidebar li{
    display: block;
    width: 100%;
}

#chatter #chatter_hero {
    background-image: url(https://photos.mikolo.co.ug/upload/2017/12/31/20171231185159-55285113.jpg);
}

.chatter_body img{
    width: 100% !important;
    height:auto;
}